package galaxy.app.network.http.server;

import java.io.IOException;
import java.io.Serializable;

import galaxy.app.log.LogHelper;
import galaxy.kernel.utils.IpUtils;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.QueryStringDecoder;

@ChannelHandler.Sharable
public class HttpServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
    // private final ViewResolver viewResolver = new DefaultViewResolver();

    // private HandleInterceptChain handleInterceptChain;

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        LogHelper.debug("http client active. channel={}", ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        LogHelper.debug("http client inactive. channel={}", ctx.channel());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // 忽略那些java.io.IOException: 远程主机强迫关闭了一个现有的连接
        if (cause instanceof IOException) {
            return;
        }
        LogHelper.error("未处理的异常={}", cause);
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest fhr) throws Exception {
        final String ip = IpUtils.getIp(ctx.channel().remoteAddress());   
        final QueryStringDecoder decoder = new QueryStringDecoder(fhr.uri()); 
        
        // HTTP请求
        // HttpServletRequest request = new HttpServletRequest(decoder.path(), fhr.method(), ip);
        // // HTTP响应
        // HttpServletResponse response = new HttpServletResponse(ctx, HttpUtil.isKeepAlive(fhr));
        // // 获取URI对应的处理器
        // // HttpMethodWrapper handler = HttpMethodManager.getHttpHandler(request.getMethod(), request.getUri());

        // boolean dispatchException = false;
        // try {
        //     // 解析请求参数
        //     request.parse(fhr, decoder);
        //     // 线程调度
        //     this.doDispatch(request, response, handler);
        // }
        // // 如果在解析参数和派发任务时抛出异常
        // catch (Throwable e) {
        //     dispatchException = true;
        //     this.processHandlerException(request, response, handler, e);
        // } finally {
        //     if (dispatchException) {
        //         response.flush();
        //     }
        // }
    }

    // private void doDispatch(HttpServletRequest request, HttpServletResponse response, HttpMethodWrapper handler) {
    //     // 没有找到对应的处理器
    //     if (handler == null) {
    //         throw new NoHandlerFoundException(request.getMethod(), request.getUri());
    //     }

    //     // 已废弃
    //     if (handler.isDeprecated()) {
    //         throw new HandlerDeprecatedException(request.getMethod(), request.getUri());
    //     }

    //     // 获取指定队列参数值
    //     final Serializable queueId = this.getQueueId(handler, request);
    //     // 异步派发
    //     final long createTime = System.nanoTime();
    //     // threadDispatcher.dispatch(queueId, () -> this.exec(request, response, handler, createTime), null, false);
    // }

    // /**
    //  * 获取这个请求的串行队列ID
    //  *
    //  * @param handler 处理器
    //  * @param request 请求对象
    //  * @return 串行队列ID可能会为null
    //  */
    // private Serializable getQueueId(HttpMethodWrapper handler, HttpServletRequest request) {
    //     // 没有设定队列ID，那就返回null，走非队列任务
    //     if (StringUtils.isEmpty(handler.getQueueIdKey())) {
    //         return null;
    //     }

    //     // 如果配置了队列ID，请求里没有，那就给个转化异常，让提示走传入参数问题.
    //     String value = request.getParameter(handler.getQueueIdKey());
    //     if (StringUtils.isEmpty(value)) {
    //         throw new ConvertException("HTTP request param error. uri=" + request.getUri() + "," + handler.getQueueIdKey() + " is required.");
    //     }

    //     // 如果有值，需要使用Handler里的参数修正类型，以确保拿到参数最终状态，不然这个调度队列就是错的，比如玩家IDLong类型与参数String
    //     for (HttpParamWrapper param : handler.getParameters()) {
    //         if (handler.getQueueIdKey().equals(param.getName())) {
    //             Converter<?> converter = this.getConverter(param.getParameter());
    //             try {
    //                 Object result = converter.convert(param.getParameter(), value);
    //                 if (result instanceof Serializable) {
    //                     return (Serializable) result;
    //                 }
    //                 // 有队列ID，但类型异常，这个要算服务器内部错误了，定义有问题
    //                 throw new UnrealizedQueueIdException(request.getMethod(), request.getUri(), handler.getQueueIdKey());
    //             } catch (Exception e) {
    //                 // 出了异常，那就是参数转化出了问题，提交请求调用者.
    //                 throw new ConvertException("HTTP request param error. uri=" + request.getUri() + " >> "
    //                         + handler.getQueueIdKey() + " >> " + value + "-->" + converter.buildErrorMsg(), e);
    //             }
    //         }
    //     }

    //     // 这里就是处理方法上没有配置队列ID参数
    //     throw new UnrealizedQueueIdException(request.getMethod(), request.getUri(), handler.getQueueIdKey());
    // }

    // private void exec(HttpServletRequest request, HttpServletResponse response, HttpMethodWrapper handler, long createTime) {
    //     // 这里已非Netty线程了
    //     final long startExecuteTime = System.nanoTime();
    //     try {
    //         this.doAction(request, response, handler);
    //     } catch (Throwable e) {
    //         this.processHandlerException(request, response, handler, e);
    //     } finally {
    //         response.flush();

    //         // 延迟时间与执行时间
    //         String ip = request.getRemoteAddr();
    //         float delay = DateUtils.formatNanoTime(startExecuteTime - createTime);
    //         float exec = DateUtils.formatNanoTime(System.nanoTime() - startExecuteTime);
    //         logger.info("handle http({}),delay={} ms,exe={} ms,ip={}", request.getUri(), delay, exec, ip);
    //     }
    // }

    // private void processHandlerException(HttpServletRequest request, HttpServletResponse response, HttpMethodWrapper handler, Throwable e) {
    //     // 404 Handler没找到...
    //     if (e instanceof NoHandlerFoundException) {
    //         this.noHandlerFound(request, response);
    //     }
    //     // API已过期...
    //     else if (e instanceof HandlerDeprecatedException) {
    //         this.handleDeprecated(request, response);
    //     }
    //     // 参数解析异常
    //     else if (e instanceof ConvertException) {
    //         this.handleConvertException(request, response, e);
    //     }
    //     // 都没有命中，那就提示服务器内部错误500
    //     else {
    //         this.handleServerException(request, response, e);
    //     }

    //     // 异常监控...
    //     ExceptionHelper.monitor(e);
    // }

    // private void doAction(HttpServletRequest request, HttpServletResponse response, HttpMethodWrapper handler) throws Exception {
    //     // 1. 业务执行前触发postHandle
    //     if (handleInterceptChain.triggerPreHandle(request, response, handler)) {
    //         return;
    //     }

    //     try {
    //         // 解析参数并执行业务逻辑
    //         Object result = handler.invoke(this.analysisParam(handler, request));

    //         // 2. 业务执行后触发postHandle
    //         handleInterceptChain.triggerPostHandle(request, response, handler, result);

    //         // 视图渲染(没有实现View，结果就当Model吧)
    //         render(request, response, handler, result);
    //     } finally {
    //         // 3. 渲染结束后触发AfterCompletion
    //         handleInterceptChain.triggerAfterCompletion(request, response, handler);
    //     }
    // }

    // private void render(HttpServletRequest request, HttpServletResponse response, HttpMethodWrapper handler, Object result) {
    //     viewResolver.resolveView(request, response, handler, result);
    // }

    // private Object[] analysisParam(HttpMethodWrapper handler, HttpServletRequest request) {
    //     // 如果没有参数，返回null.
    //     if (handler.getParameters().isEmpty()) {
    //         return new Object[0];
    //     }

    //     List<Object> args = new ArrayList<>(handler.getParameters().size());
    //     for (HttpParamWrapper param : handler.getParameters()) {
    //         // Request请求参数
    //         if (HttpServletRequest.class.isAssignableFrom(param.getParameter().getType())) {
    //             args.add(request);
    //         }
    //         // 其他转化器参数
    //         else {
    //             Converter<?> converter = this.getConverter(param.getParameter());
    //             String data = request.getParameter(param.getName());

    //             if (data == null) {
    //                 // 必选参数必需有值
    //                 if (param.isRequired()) {
    //                     throw new ConvertException("HTTP request param error. uri=" + request.getUri() + "," + param.getName() + " is required.");
    //                 }
    //                 // 不是必选参数，那就使用默认值来转化
    //                 else {
    //                     try {
    //                         args.add(converter.convert(param.getParameter(), param.getDefaultValue()));
    //                     } catch (Exception e) {
    //                         throw new ConvertException("HTTP request default param error. uri=" + request.getUri() + "," + param.getName() + "=" + param.getDefaultValue() + "-->" + converter.buildErrorMsg(), e);
    //                     }
    //                 }
    //             } else {
    //                 try {
    //                     args.add(converter.convert(param.getParameter(), data));
    //                 } catch (Exception e) {
    //                     throw new ConvertException("HTTP request param error. uri=" + request.getUri() + "," + param.getName() + "=" + data + "-->" + converter.buildErrorMsg(), e);
    //                 }
    //             }
    //         }
    //     }
    //     return args.toArray();
    // }

    // private Converter<?> getConverter(Parameter field) {
    //     Converter<?> result = ConvertManager.getInstance().getConverter(field.getType());
    //     if (result == null) {
    //         throw new UnrealizedException("未实现的注入(" + field.getType().getName() + ")" + field.getName());
    //     }
    //     return result;
    // }

    // /**
    //  * 500服务器内部错误.
    //  *
    //  * @param request  请求对象
    //  * @param response 响应对象
    //  * @param e        异常信息
    //  */
    // private void handleServerException(HttpServletRequest request, HttpServletResponse response, Throwable e) {
    //     logger.warn("internal error for HTTP request with URI [{}] in DispatcherServlet. ip={}{}", request.getUri(), request.getRemoteAddr(), e);
    //     response.setStatus(HttpResponseStatus.INTERNAL_SERVER_ERROR.code());
    //     response.writeObject(new HttpResult(HttpErrorCode.INTERNAL_ERROR, "request's API internal error."));
    // }

    // /**
    //  * API方法的参数解析异常情况.
    //  *
    //  * @param request  请求对象
    //  * @param response 响应对象
    //  * @param e        异常信息
    //  */
    // private void handleConvertException(HttpServletRequest request, HttpServletResponse response, Throwable e) {
    //     logger.warn("parameters invalid for HTTP request with URI [{}] in DispatcherServlet. ip={}{}", request.getUri(), request.getRemoteAddr(), e);
    //     response.setStatus(HttpResponseStatus.BAD_REQUEST.code());
    //     response.writeObject(new HttpResult(HttpErrorCode.PARAMETERS_INVALID, "request's API parameters invalid."));
    // }

    // /**
    //  * API方法已过期.
    //  *
    //  * @param request  请求对象
    //  * @param response 响应对象
    //  */
    // private void handleDeprecated(HttpServletRequest request, HttpServletResponse response) {
    //     logger.warn("deprecated for HTTP request with URI [{}] in DispatcherServlet. ip={}", request.getUri(), request.getRemoteAddr());
    //     response.setStatus(HttpResponseStatus.LOCKED.code());
    //     response.writeObject(new HttpResult(HttpErrorCode.API_DEPRECATED, "request's API Deprecated."));
    // }

    // /**
    //  * 404的默认处理方案.
    //  *
    //  * @param request  请求对象
    //  * @param response 响应对象
    //  */
    // private void noHandlerFound(HttpServletRequest request, HttpServletResponse response) {
    //     logger.warn("No mapping found for HTTP request with URI [{}] in DispatcherServlet. ip={}", request.getUri(), request.getRemoteAddr());
    //     response.setStatus(HttpResponseStatus.NOT_FOUND.code());
    //     response.writeObject(new HttpResult(HttpErrorCode.NO_API, "request's API Unrealized."));
    // }
    
}
